Let greenspline and gpsgridder export and import Green's function coefficients
|Target version:||Candidate for next minor release|
Add an option that lets these programs optionally save the (x, y, force) per Green's function to a file. Also, ability to read back in this force file instead of solving Ax = b all over again and then evaluate the solution at the desired nodes. Could possible be implemented so that it may be available via -n to grdtrack.